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Your phone may contain virus files so you should format your phone, OR if you have an anti virus installed, that reduces the functioning speed of phone, you can also use RAM BOOSTERS, you can get it from umnet.com... Rate my answer

it must be throw by resetting all ur mobile. the resetting u can get in ur mobile setting when u trying all reset it will ask the passport then press the passport if u have or if u don't have press 0000

VIRUS. the only one problem for such phone make you mobile phone slow . damage your software , resart your phone,and even use your battery and reduce your talk time so the solution is flash your phone or reset your phone to factor setting and that will make you lose your personal data .. the only solution